Method for removing molybdenum from man-made mineral formations

FIELD: metallurgy.

SUBSTANCE: method involves electrochemical and photochemical synthesis of active oxidisers and complexing agents in leaching solution with the production of anolyte and catholyte. Then mineral mass containing molybdenum is successively treated by them thus providing for the transition of molybdenum into liquid phase from which it can be removed by extraction or sorption.

EFFECT: improved efficiency of process due to the reduction of expenditures on reagents and electric power.

2 cl, 1 ex

 

The invention relates to hydrometallurgy of non-ferrous and noble metals, namely the leaching of molybdenum from technogenic mineral formations, and is intended for industrial extraction of valuable metals.

There is a method of leaching of molybdenum from ores, including crushing, grinding, flotation getting them from the concentrate and the impact in the autoclave under high pressure and at elevated temperature with a solution of soda with getting productive solutions (see Zelikman A.N. Metallurgy of rare metals, metallurgy, 1991, p.41-60).

The disadvantage of this method is inappropriate for its use in the processing of the poor, hard ores and mineral mass formations that caused a significant share of the cost of its implementation.

Closest to the claimed method is leaching of molybdenum from mineral raw materials with electrochemical processing prepared on the basis of the slurry, the liquid phase which contains chloride and sodium carbonate, which, when its circulation through the electrolytic cell is converted in the anode zone in the system is highly active oxidant of sulphur and molybdenum, which provides the transition from the crystal lattice of molybdenite in the liquid phase of the slurry (see US patent No. 3849265 Bernard J. Sheiner at al.)

The efficiency of the data method also is not large enough due to the significant cost of electricity for pumping pulp and synthesis reagents.

The technical result of the proposed invention is to improve the efficiency of the method of extraction of molybdenum from technogenic mineral formations by reducing the unit cost of electricity and chemicals, while ensuring a high level of extraction.

This technical result is achieved in that the method of extraction of molybdenum from technogenic mineral formations, including crushing, grinding and leaching of molybdenum leaching solution, obtained by electrochemical synthesis, containing oxidants, characterized in that the leaching of molybdenum mineral mass produced in two stages, the first stage is obtained by electrochemical synthesis from soda solution in the anode chamber of the electrolyzer anolyte, representing the irradiated UV light water-gas suspension containing in the liquid phase sulfuric and carbonic acid, hydrogen peroxide, hydroxyl radical, and in the gas phase carbon dioxide, atomic and dvuhtomnyy oxygen, ozone, dimeric carboxylic cations(C2O4+)at the second stage - Catolica representing received in a cathode chamber of the electrolytic cell soda-alkaline solution, the content is the overall carbonate, hydrogen and sodium hydroxide.

The method is also distinguished by the fact that before entering Catolica it is saturated with oxygen and subjected to UV-irradiation.

Distinctive features of the proposed method is that its leaching of mineral mass produced in two stages: at the first stage of the anolyte representing received in the anode chamber of the cell and irradiated with UV-light water-gas suspension containing in the liquid phase sulfuric and carbonic acid, hydrogen peroxide, hydroxyl radical, and in the gas phase carbon dioxide, atomic and dvuhtomnyy oxygen, ozone, dimeric carbosilane cations(C2O4+)at the second stage - Catolica representing received in a cathode chamber of the electrolytic cell soda-alkaline solution containing carbonate, bicarbonate and sodium hydroxide.

This set of distinctive features improves the efficiency of the method leaching of molybdenum by reducing energy costs and reagents, eliminating the need for circulation of the pulp through the electrochemical cell and increases the proportion of active leaching molybdenum components, synthesized as a result of joint use is education electrochemical and photochemical processes.

The method is as follows.

In an electrochemical membrane reactor was placed a solution of technical soda and apply voltage to the electrodes. At the anode starts to separate carbon dioxide and dvuhtomnyy oxygen, and in the liquid phase, it forms carbonic acid in the cathode chamber is released at the cathode hydrogen, and in the liquid phase is formed more (hydrolytic) alkali. To enhance the yield of oxygen in the anode chamber for 30-60 min after the start of electrolysis add sulfuric acid to achieve pH=3-3 .5 and is exposed anode area source of UV radiation than the active form of the water-gas suspension containing, in addition to coal and sulfuric acid, hydrogen peroxide and hydroxyl radical, and in the gas phase evolved during the electrolysis of carbon dioxide, atomic, singlet dvuhtomnyy oxygen, ozone and dimeric carboxylic cations(C2O4+). Photoelectrochemical processing anolyte continue 15-30 minutes Received analtoy suspension process mineral material containing molybdenite by irrigation (heap leaching) or forming the pulp (canulae and sample leaching). Resulting active oxidizing and sets obrazuyuschie components of the gas-liquid suspensions begin to rapidly oxidize the molybdenum in the upper layers of the mineral matrix of molybdenite with the formation of molybdenum acid MOS 2+H2CO3+3H2O2=H2MoO4+3H2O+CO2+S2,

MoS2+(C2O4)+*nH2O=H2MoO4+S2+2H2CO3+(n-6)H2O+6H+

At the same time, clustering and partial oxidation of sulfur active oxygen, with the formation of sulfates, which provides in General the preparation of the following layers of the mineral matrix to the leaching of molybdenum.

After treatment with anolyte carry out the addition to the water-mineral mixture Catolica and, accordingly, doselectone molybdenum active sodium carbonate formed by the reaction of carbonic acid with sodium hydroxide (as a part of Catolica). Previously, to compensate for the loss of active oxygen in the anolyte, catholyte is saturated with oxygen and irradiated with UV light. The treatment of the mineral mass of the mixture of the analyte and Catolica, developed on the contact surface of the particles of molybdenite actively flows through the reaction of molybdenum with sodium carbonate and active oxygen:

2MoS2+6Na2CO3+3O3=2Na2MoO4+CO2+4Na2SO4

This ensures a high level of extraction of molybdenum at a relatively low cost of electricity and chemicals.

An example of a specific use of the method.

Stale tailings ores Shakhtinsk the th field, which is uncovered in the molybdenum concentrate mainly composed pereselenskogo in the process of pretreatment of molybdenite.

Preparing active 1.0%soda solution by bubbling air for oxygen saturation in the diaphragm electrochemical electrolysis reactor for 1 hour, after that, to enhance the yield of oxygen in the anode chamber was added sulfuric acid to achieve pH=3 and irradiated anode zone of the UV light in the range of 180-300 nm lamps CES-230 30 min Obtained active water-gas suspension used to prepare the slurry on the basis of tailings W:T=1:3, kept her in a cell for 3 days, after which was added to the slurry catholyte, optionally enriched with oxygen and passed UV-irradiation. The catholyte was injected into the slurry to achieve pH=8.5 in W:T=1:1.2 and barbotirovany it for 2 hours, after which he entered the ion exchange resin selective for molybdenum and continued sparging for 3 hours. Then saturated resin was separated on a sieve.

Extraction of molybdenum on the resin was 75%of that for the processing of tailings is quite high.

1. The method of extraction of molybdenum from technogenic mineral formations, including crushing, grinding and leaching of molybdenum leaching solution,obtained by electrochemical synthesis, containing oxidizing agents, characterized in that the leaching of molybdenum mineral mass produced in two stages, the first stage is obtained by electrochemical synthesis from soda solution in the anode chamber of the electrolyzer anolyte, representing the irradiated UV light water-gas suspension containing in the liquid phase sulfuric and carbonic acid, hydrogen peroxide, hydroxyl radical, and in the gas phase carbon dioxide, atomic and dvuhtomnyy oxygen, ozone, dimeric carboxylic cations (C2About4+), and at the second stage - Catolica representing received in a cathode chamber of the electrolytic cell soda-alkaline solution containing carbonate, bicarbonate and sodium hydroxide.

2. The method according to claim 1, characterized in that before leaching Catolica it is saturated with oxygen and subjected to UV-irradiation.



 

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1 tbl, 1 ex

FIELD: metallurgy.

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EFFECT: lower costs, higher yield.

10 cl, 4 tbl, 2 ex

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